diff --git a/desmume/src/MMU.cpp b/desmume/src/MMU.cpp
index 2e0f84129..2dff96241 100644
--- a/desmume/src/MMU.cpp
+++ b/desmume/src/MMU.cpp
@@ -174,6 +174,7 @@ void mmu_log_debug_ARM7(u32 adr, const char *fmt, ...)
 #define DUP16(x) x, x, x, x,  x, x, x, x,  x, x, x, x,  x, x, x, x
 
 MMU_struct MMU;
+MMU_struct_new MMU_new;
 
 u8 * MMU_struct::MMU_MEM[2][256] = {
 	//arm9
@@ -1793,7 +1794,7 @@ void FASTCALL _MMU_ARM9_write16(u32 adr, u16 val)
 
 				if (val == 0)
 				   //mc_reset_com(&MMU.bupmem);     // reset backup memory device communication
-				   MMU.backupDevice.reset_command();
+				   MMU_new.backupDevice.reset_command();
 				return;
 
 			case REG_AUXSPIDATA:
@@ -1801,7 +1802,7 @@ void FASTCALL _MMU_ARM9_write16(u32 adr, u16 val)
 				   AUX_SPI_CMD = val & 0xFF;
 
 				//T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, bm_transfer(&MMU.bupmem, val));
-				T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, MMU.backupDevice.data_command(val));
+				T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, MMU_new.backupDevice.data_command(val));
 				return;
 
 			case REG_DISPA_BG0CNT :
@@ -3086,7 +3087,7 @@ void FASTCALL _MMU_ARM7_write16(u32 adr, u16 val)
 
 				if (val == 0)
 				   //mc_reset_com(&MMU.bupmem);     // reset backup memory device communication
-				   MMU.backupDevice.reset_command();
+				   MMU_new.backupDevice.reset_command();
 			return;
 
 			case REG_AUXSPIDATA:
@@ -3094,7 +3095,7 @@ void FASTCALL _MMU_ARM7_write16(u32 adr, u16 val)
 				   AUX_SPI_CMD = val & 0xFF;
 
 				//T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, bm_transfer(&MMU.bupmem, val));
-				T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, MMU.backupDevice.data_command(val));
+				T1WriteWord(MMU.MMU_MEM[ARMCPU_ARM7][(REG_AUXSPIDATA >> 20) & 0xff], REG_AUXSPIDATA & 0xfff, MMU_new.backupDevice.data_command(val));
 			return;
 
 			case REG_SPICNT :
diff --git a/desmume/src/MMU.h b/desmume/src/MMU.h
index 98db5c2d1..a147ea934 100644
--- a/desmume/src/MMU.h
+++ b/desmume/src/MMU.h
@@ -118,7 +118,6 @@ struct MMU_struct {
 	  
     memory_chip_t fw;
     memory_chip_t bupmem;
-	BackupDevice backupDevice;
 	  
     nds_dscard	dscard[2];
 	u32			CheckTimers;
@@ -126,7 +125,13 @@ struct MMU_struct {
 		  
 };
 
+struct MMU_struct_new
+{
+	BackupDevice backupDevice;
+};
+
 extern MMU_struct MMU;
+extern MMU_struct_new MMU_new;
 
 
 struct armcpu_memory_iface {
diff --git a/desmume/src/NDSSystem.cpp b/desmume/src/NDSSystem.cpp
index e063f4bee..0ff38f34e 100644
--- a/desmume/src/NDSSystem.cpp
+++ b/desmume/src/NDSSystem.cpp
@@ -834,7 +834,7 @@ int NDS_LoadROM( const char *filename, int bmtype, u32 bmsize,
 
 	//mc_realloc(&MMU.bupmem, bmtype, bmsize);
 	//mc_load_file(&MMU.bupmem, buf);
-	MMU.backupDevice.load_rom(buf);
+	MMU_new.backupDevice.load_rom(buf);
 
 	memset(buf, 0, MAX_PATH);
 	strcpy(buf, pathFilenameToROMwithoutExt);
@@ -904,7 +904,7 @@ void NDS_Reset(BOOL resetBySavestate)
 	currFrameCounter=0;
 
 	MMU_clearMem();
-	MMU.backupDevice.reset();
+	MMU_new.backupDevice.reset();
 
 	//ARM7 BIOS IRQ HANDLER
 	if(CommonSettings.UseExtBIOS == true)
diff --git a/desmume/src/saves.cpp b/desmume/src/saves.cpp
index 05fe8540a..af6ea2fcf 100644
--- a/desmume/src/saves.cpp
+++ b/desmume/src/saves.cpp
@@ -258,7 +258,7 @@ static void mmu_savestate(std::ostream* os)
 	write32le(2,os);
 	
 	//newer savefile system:
-	MMU.backupDevice.save_state(os);
+	MMU_new.backupDevice.save_state(os);
 }
 
 static bool mmu_loadstate(std::istream* is, int size)
@@ -297,14 +297,14 @@ static bool mmu_loadstate(std::istream* is, int size)
 
 		u8* temp = new u8[bupmem_size];
 		is->read((char*)temp,bupmem_size);
-		MMU.backupDevice.load_old_state(addr_size,temp,bupmem_size);
+		MMU_new.backupDevice.load_old_state(addr_size,temp,bupmem_size);
 		delete[] temp;
 		if(is->fail()) return false;
 	}
 	else if(version == 2)
 	{
 		//newer savefile system:
-		MMU.backupDevice.load_state(is);
+		MMU_new.backupDevice.load_state(is);
 	}
 
 	return true;